21375124312507 has 32 divisors (see below), whose sum is σ = 25107188004864. Its totient is φ = 17815719398400.

The previous prime is 21375124312489. The next prime is 21375124312541. The reversal of 21375124312507 is 70521342157312.

It is not a de Polignac number, because 21375124312507 - 2¹¹ = 21375124310459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21375124312567) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 116976868 + ... + 117159454.

It is an arithmetic number, because the mean of its divisors is an integer number (784599625152).

Almost surely, 2^{21375124312507} is an apocalyptic number.

21375124312507 is a deficient number, since it is larger than the sum of its proper divisors (3732063692357).

21375124312507 is a wasteful number, since it uses less digits than its factorization.

21375124312507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183979.

The product of its (nonzero) digits is 352800, while the sum is 43.

Adding to 21375124312507 its reverse (70521342157312), we get a palindrome (91896466469819).

The spelling of 21375124312507 in words is "twenty-one trillion, three hundred seventy-five billion, one hundred twenty-four million, three hundred twelve thousand, five hundred seven".